Calcule:
a. - 10 - 6 + 3
b .+ 8 - 7 + 9 - 5
c. - 4 - 3 - 2 + 1 + 2 + 3
d. + 8 - 17 + 5 - 14 - 20
Pfv, me ajudaaa
É pra amanhã!!!!!!!!!!
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